Adventures in Apache OpenWhisk

Adventures in Apache OpenWhisk Rob Allen January 2019 Slides: https://akrabat.com/5507

Apache OpenWhisk Rob Allen ~ @akrabat

Apache OpenWhisk • • • • OpenSource http://openwhisk.org Incubator project working towards graduation Many contributors from multiple companies Rob Allen ~ @akrabat

Apache OpenWhisk • Self-hosted. Deploy to: - Kubernetes - Mesos - OpenShift - Dev: Vagrant & Docker Compose • Multiple public providers: - IBM - RedHat - Adobe (for Adobe Cloud Platform APIs) Rob Allen ~ @akrabat

Supported languages • • • • • .NET Core Go NodeJS Python Swift • • • • Ballerina Java PHP Ruby Also, your own Docker container can be deployed & invoked Rob Allen ~ @akrabat

Concepts Rob Allen ~ @akrabat

Event providers (feeds) • • • • • • Alarms (scheduled tasks) CouchDB GitHub Kafka Push notifications RSS Rob Allen ~ @akrabat

Getting started with OpenWhisk Rob Allen ~ @akrabat

Hello World def main(args): name = args.get(“name”, “World”) message = ‘Hello {}!’.format(name) return {‘body’: message} Rob Allen ~ @akrabat

Hello World def main(args): name = args.get(“name”, “World”) message = ‘Hello {}!’.format(name) return {‘body’: message} Rob Allen ~ @akrabat

Hello World def main(args): name = args.get(“name”, “World”) message = ‘Hello {}!’.format(name) return {‘body’: message} Rob Allen ~ @akrabat

Hello World def main(args): name = args.get(“name”, “World”) message = ‘Hello {}!’.format(name) return {‘body’: message} Rob Allen ~ @akrabat

Hello World def main(args): name = args.get(“name”, “World”) message = ‘Hello {}!’.format(name) return {‘body’: message} Rob Allen ~ @akrabat

Deploy to OpenWhisk $ zip -q hello.zip hello.py Rob Allen ~ @akrabat

Deploy to OpenWhisk $ zip -q hello.zip hello.py $ wsk action update —kind python:3.7 hello hello.zip ok: updated action hello Rob Allen ~ @akrabat

Run it $ wsk action invoke hello —result —param name Rob Rob Allen ~ @akrabat

Deploying your action $ wsk action invoke hello —result —param name Rob { “body”: “Hello Rob!” } Rob Allen ~ @akrabat

Segue: How did it do this?! Rob Allen ~ @akrabat

OpenWhisk’s architecture Rob Allen ~ @akrabat

Create an action Rob Allen ~ @akrabat

Invoke an action Rob Allen ~ @akrabat

Action container lifecycle • Hosts the user-written code • Controlled via two end points: /init & /run Rob Allen ~ @akrabat

Action container lifecycle • Hosts the user-written code • Controlled via two end points: /init & /run Rob Allen ~ @akrabat

End Segue Rob Allen ~ @akrabat

Web-enabled actions Access your action via HTTP: Perfect for web hooks Add the —web flag: $ wsk action update —kind python:3.7 —web true \ demo/hello hello.zip Rob Allen ~ @akrabat

Web-enabled actions Get URL and curl it: $ wsk action get —url demo/hello ok: got action hello https://192.168.1.17/api/v1/web/guest/demo/hello $ curl https://192…17/api/v1/web/guest/demo/hello?name=Rob { “body”: “Hello World!” } Rob Allen ~ @akrabat

API Gateway When you want to do more with HTTP endpoints • • • • • Route endpoint methods to actions (Open API Spec support) Custom domains Rate limiting Security (API keys, OAuth, CORS) Analytics Rob Allen ~ @akrabat

API Gateway Rob Allen ~ @akrabat

API Gateway $ wsk api create /myapp /hello GET hello Rob Allen ~ @akrabat

API Gateway $ wsk api create /myapp /hello GET hello ok: created API /myapp/hello GET for action /_/hello Rob Allen ~ @akrabat

API Gateway $ curl https://example.com/myapp/hello?name=Rob Rob Allen ~ @akrabat

API Gateway $ curl https://example.com/myapp/hello?name=Rob { “message”: “Hello Rob!” } Rob Allen ~ @akrabat

Packages • Group actions together • Set parameters used by all actions $ wsk package update demo $ wsk action update —kind python:3.7 demo/hello hello.zip Rob Allen ~ @akrabat

Built-in packages • • • • • • alarms github kafka pushnotifications utils weather • • • • • • cloudant jira pushnotifications slack watson websocket • & any other publicly shared package Rob Allen ~ @akrabat

Sequences Invoke a set of actions in turn Rob Allen ~ @akrabat

Composer: Logic for your actions Rob Allen ~ @akrabat

Composer: Logic for your actions Rob Allen ~ @akrabat

Composer: It’s just code composer.sequence( composer.if( ‘binday/authenticate’, composer.sequence( ‘format_input_from_alexa’, composer.if( ‘binday/validate’, ‘binday/get_next_bin_day’ ‘binday/send_failure’ ), ), ‘binday/send_failure’ ), ‘binday/format_output_for_alexa’ ) Rob Allen ~ @akrabat

Deployment: Serverless Framework Set up: $ $ $ $ npm install —global serverless serverless-openwhisk serverless create —template openwhisk-php —path app cd app npm install Rob Allen ~ @akrabat

serverless.yml service: ow-todo-backend provider: name: openwhisk runtime: php plugins: - serverless-openwhisk Rob Allen ~ @akrabat

serverless.yml functions: list-todos: handler: “src/actions/listTodos.main” name: “todo-backend/list-todos” events: - http: path: /todos method: get add-todo: handler: src/actions/addTodo.main # etc Rob Allen ~ @akrabat

Deploy $ serverless deploy Serverless: Packaging Serverless: Compiling Serverless: Compiling Serverless: Compiling Serverless: Compiling Serverless: Compiling Serverless: Compiling Serverless: Deploying Serverless: Deploying Serverless: Deploying […] service… Functions… Packages… API Gateway definitions… Rules… Triggers & Feeds… Service Bindings… Packages… Functions… API Gateway definitions… Rob Allen ~ @akrabat

Resources • http://www.openwhisk.org • https://github.com/apache/incubator-openwhisk-workshop • https://serverless.com/framework/docs/providers/openwhisk Developing Serverless Applications by Raymond Camden Free via https://akrab.at/openwhiskbook Rob Allen ~ @akrabat

Thank you! Rob Allen ~ @akrabat